Since I started watching the NFL the league has always claimed to have parity. I thought it was Pete Rozelle that came up with "any given Sunday" no later than 1970. How are you measuring parity? Is it by how many games the best teams win? Point differential, how many different teams win SBs, reach SBs, something else?
Also, while QB salaries are going up in nominal terms are they actually going up as a % of the cap? I actually think they should be but I don't know if they are. This year the QB franchise tag is is $24.8 mil, the 2nd highest tag is for DE at $17.1 mil. There's no way those values are right if you're basing the value of a player on how much impact he has on winning and losing. The structure of the game just make the QB far more important than any other position. This was always true but the rule change and emphasis on certain rules hasmade the QB even more important.
The teams with the best QBs always had a big advantage (not necessarily a decisive advantage) and it's more true now than it was 20-50 years ago. (yeah I'm old) Personally I liked the style of football from the 1980s because you could win with different styles. The Commanders won 3 SBs with a smashmouth run game, strong D, ok to good QBs. SF won with Jo Montana and the West Coast offense, the Giants won with LT a great D and a good balanced offense. The winning style has become more and more QB centric. That's why I see KC over the next decade as the most likely dominant team. (as long as they can add some good players that can avoid being thrown out of the league for beating up women and children) Perhaps theother teams will look at Mahomes film and come up with plans to force him to his weaknesses. OTOH they may look at the film and determine, "this guy is just bleeping good".